Elevator lock



W. S. CAMPBELL.

ELEVATOR LOCK. APPLICATION FILED own, 1920.

1,417,450, Patentd May 23,1922.

2 SHEETS-SHEET I.

' INVENTOR Wiill'am J. (I'll/W12: A 555; 52 1 4M 96, iiw ATTORNEYS W. S; CAMPBELL. ELEVATOR LOCK. APPLICATION FILED 050.22, 1920.

1,417,450. Patented. May23, 1922.

2 SHEETS-SHEET 2.

W W N w 52 65 a A 5 f q M F -65 a f l s\\\\'\\\\\x 4 03 x ,A

P1316. W F1817. v O I O WITNESSES llVI/EIVTUR W Wham S. Campbell.

A TTOB/VEYS jar/M ELEVATOR LOCK.

iai'naeo Specification of Letters Patent.

Patented May 23, 1922.

Original application filed November 25, 1919, Serial No. 340,447. Divided and this application filed December 22, 1920.

To all 10 7mm it may concern:

Be it known that I, lVILLrAM Soo'rr CAMP- BELL, a citizen of the United States, and a resident of New Kensington, in the county of Vvestmoreland and State of Pennsylvania, have invented certain new and useful Improvements in Elevator Locks, of which the following is a specification.

My invention relates to improvements in elevator looks, it being for use on both passenger and freight elevators, but particularly freight elevators, and it consists in the constructions, combinations and mode of operation herein described and claimed.

One of the foremost objects of the invention is to provide an elevator door lock, which is so arranged that the power cannot be turned on until the door is closed and locked.

A further object of the invention is to provide a lock for the door or doors leading from a landing to an elevator shaft, operated by the power controller of the elevator.

A further object of the invention is to provide means for preventingthe gates of an elevator shaft from being opened except when the elevator is ready to receive freight, and to prevent the elevator from being moved until the gates are closed and se-- curely fastened.

Another object of the invention is to provide an elevator lock arranged to prevent the opening of anelevator shaft door from the inside, the lock of said door being controlled by the operator from the inside of the elevator.

Other objects and advantages will appear in the following specification, reference being had to the accompanying drawings, in which:

Figure 1 is a side elevation of so much I of a freight elevator as is necessary to illustrate the application of the invention, the controller handle being shown looked as it is when the door in Figure 7 is open,

Figure '2 is a plan viewofthe elevatorcarried mechanism shown in Figure 1,

Figure 3 is cross section taken substantially on the line 33 of Figure 2,

Figure 4 is a detail perspective view of the special chain link to which the ramp is attached,

Figure 5 is a cross section taken substantially on the line 5-5 of Figure 2,

Serial No. l32,531.

Figure 6 is a detail view showing the shaft doors of a freight elevator closed, at which time the elevator is free to raise and lower, and c Figure 7 is a similar view showing the doors open and illustrating how the mechanism is prevented from being operated when the doors are thus open.

This application is a division of my copen'ding application for Letters Patent on elevator locks, filed November 25, 1919, Serial No. 340,447. In that application, is shown and described a mechanism for locking the double doors of passenger elevators in particular, in addition to the description and illustration of mechanism for locking the doors of freight elevators. The present application is confined to the latter invention.

Referring to Figure 1, it is to be observed that the freight elevator 1 runs in the shaft 3, which has a plurality of landing openings closable by sliding doors 64 and 65 as, for example, in Figure 6. These doors are intended to be opened from the inside, i. e., inside of the elevator only, and it is the purpose of the lock mechanism to prevent shifting the handle of the controller while these doors are open.

The controller 25 is but generally illus trated in Figure 1, and there in dotted lines. The handle 26 of the controller occupies the notched end 27 of the handle grip 28, which is mounted on the extension shaft 29, in turn supported in a suitable bearing afiixed to the side of the elevator, as for example the plate 30.

A pulley 36 is aiiixed to the shaft 29 outside of the elevator 1. The divided ends 37 of the chain 38 are secured at 39 to the respective sides of the pulley 36, as clearly shown in Figure 1, so that when the con troller handle26 is turned in either direction to go up or down, the chain 38 is in each case pulled upwardly in the direction of the arrow a in Figure 1.

Below the elevator there is an end pulley 5 :0 to which the chain 38 is secured at 44-. Mounted on the countershaft 13, about as shown in Figure 2, is the pulley as which is adjustable along the shaft by the means 4C6. Arranged in parallelism both with the countershaft 13 and the ramp pulley 4:5, is a shaft 4:7 with a weight pulley 4,8. A chain 49, affixed at to the pulley i5, hangs over the pulley 48 and carries the weight 42 at the bottom.

Secured at 51 to, the chain 49, is the ramp bar 52. It is made with a locking head 53 on the outer extremity, for engaging the lock bar 54: on one of the elevator shaft doors, as mentioned in connection with Figure 6.

The fastening means 51 between the chain 49 and ramp bar 52, is nothing more than a bolt orequivalent means extending between the two. The chain 49 includes an especially made link 55, illustrated in detail in Figure 4, for the purpose of receiving the bolt 51. The ramp bar 52 is slidably mounted in suitable-angle guides 56, mounted in a suitable housing 57, which is laterally adjustably mounted at 58" in the supporting frame or base 59, which has slots 60 enabling such lateral adjustment.

Provision for the adjustment of the pulleys 15, 48 and housing 57 must be made so that any variations in the positions of the elevator shaft carried parts of the lock may be compensated for. If the housing 57 is moved, it of course follows that the pulley 45 must be adjusted so as to keep the intervening chain 419 in the proper position straight across. As shown inFigure 1, the frame or base 59 is supported at 61 beneath the fioor'of the elevator, and the base has bearings 62 and 63 for the shafts 13 and 47 respectively.

When the freight elevator 1 approaches a landing at which the doors 64 and 65 are closed, as in'Figure 6, the lock head 53 should assume a position a little below the end of the lock bar about as shown in Figure 6. The operatornow opens the doors 6st, 65 from the inside, these doors usually having locking means capable of operation only from the inside, whereupon the lock bar 5 1 rides down behind the lock head 53 as clearly shown in Figures 1 and 2. This causes an interlocking engagement which positively prevents the starting of the car by means of the controller handle 26, while the doors 64, 65 are open.

'Consider the views just mentioned, for a moment. It is easy to see that turning the controller handle 26 in either direction has panion parts with it. But according to the present situation of the parts, that is to say, the engagement of the lock head 53 behind the lock bar 54, movement of the controller handle is prevented because none of the parts areable to move as long as the head 53 remains behind the bar 54. The operator must "first close the doors so that they assume the originalp'osition shown in Figure 6, before the bar 54: will be free of the head 53, and

' the ramp bar 52 can be drawn inwardly without obstruction. Now the operator may move the controller handle 26 in either direction, depending on whether he desires to go up or down, the elevator lock being now free to permit such movement.

It is to be observed that the movement of the controller handle 26 in either" right or left direction has only the one result of retracting the ramp bar 52; the pulley all) and its companion rotatable parts, can rotate only in the counter-clockwise direction by virtue of the operation of the controller handle. The ramp bar is gravity-projected by virtue of the weight as hanging from the chain 49.

While the construction and arrangement of the improved elevator lock as herei'ndescribed and claimed, is that ofa generally preferred form, obviously modifications and changes may be made, without departing from the spirit of the invention or the scope of the claims.

I claim 1. In combination, slidable elevator shaft doors, one with engageable lock means; an elevator with lock means, adapted to stop close to the engageable lock means which is moved behind the lock means when the doors are slid open; and means operatively disposed between said lock means and the controller handle of the elevator 'to which it is connected, preventingthe shifting of the handle from aneutral position until said doors are closed to disengage both said lock means.

2. In combination, an elevator with a controller handle, a slidable ramp bar'with a lock head, means rotatable to retract the bar and head, a connection between said means andthe handle which rotates said means in one direction when the handle is shifted in either direction, and a lock bar carried by a shaft-opening elevator door, sli'dable behind the lock head when projected into positionby moving the controller handle to neutral, and preventing shifting of the handle until said door is again closed.

3. An elevator lock, comprising a shaft door-carried element, and means operatively associated withthe controller of an elevator, adapted to be disposed in a position for subsequent operative engagement with saidelement when the controller is moved to a neutral position; j I

4:. An elevator lock, comprising means, operatively associated with the controller of an elevator, adapted to be disposed in a predetermined position when the controller is moved to neutral; and an element carried by an adjacent elevator shaft-door, capable of operative engagement with said means at said position when the door is opened, to prevent shifting of thecontroller in either direction a long as said operative engagement continues. l

5. An elevator lock, comprising means operatively associated with an elevator connected means by which the lock means is reciprocated on shifting the controller, a

companion lock element fixed on a shaft 15 door, and mean on said reciprocable lock member, registering With said element when the elevator is adjacent the door behind which said element moves on opening the door to establish a locking engagement pre- 20 venting operation of the controller through said interconnections.

WILLIAM S. CAMPBELL. 

